linking schemes to controller about arc

[jellegerbrandy]

I see now that I could derive the type of scheme from its permissions. But we will need an interface also for other types of schemes. I'd go for the second option: each Scheme as a type or schemeType attribute that has the same name as the contract - from that we can derive its interface (if we have the code).

[jellegerbrandy]

After talking to adam we'll do it lke this:

• We know at which address our schemes are "officially deployed"
• We keeep a list o fthese addresses with their associated interfaces in the library and use that

[leviadam]

I think this can be closed.